Date formatting on the GridColumn

I have a date field on my class, displays the data using the below GridColumn, but, I cannot get it to format the date string, no matter what I do I always seem to get 2020-07-31T00:00:00

<GridColumn
                field="del_Date"
                title="Del Date"
                width="150px"
                editable={false}
                filter="date" 
                format="{0:D/M/YY}"
              />

I have followed the documentation and the above seems to be correct, what could I be doing wrong?